/**
 * Copyright (C) 2016 The Weghst Inc. <kevinz@weghst.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.weghst.setaria.console.web;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.http.HttpStatus;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

/**
 * 登录验证拦截器.
 *
 * @author Kevin Zou (kevinz@weghst.com)
 */
public class LoginValidatingInterceptor extends HandlerInterceptorAdapter {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        HttpSession session = request.getSession();
        if (session.getAttribute(Constants.SESSION_USER_ATTR_NAME) == null) {
            response.sendError(HttpStatus.UNAUTHORIZED.value(), HttpStatus.UNAUTHORIZED.getReasonPhrase());
            return false;
        }
        return true;
    }
}
